<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <input id="input" type="text">
    <div id="div"></div>

    <script>
        let obj = {};
        let temp = {};
        let oInput = document.getElementById("input");
        let oDiv = document.getElementById("div");

        Object.defineProperty(obj,"name",{
            get(){
                return temp["name"];
            },
            set(val){
                temp["name"] = val;
                oInput.value = obj.name;
                oDiv.innerHTML = obj.name;
                //console.log(obj.name);
            }
        })

        oInput.addEventListener('input',function(){
            obj.name = this.value;  
        })
    </script>
</body>
</html>